Due to the linked changes in homebrew deprecating "unused" download
strategies and the suggested workaround of adding a custom
"require_relative" I have added the ability to specify a ruby filename
in the brew specification
My use case is to continue using the GitHubPrivateRepositoryDownloadStrategy
without a deprecation warnings on every brew install.
brew deprecation:
599ecc9b5a (diff-ad9201cdd3b6f948345629ad812cd5bd)
suggested workaround:
https://github.com/Homebrew/brew/issues/5074#issuecomment-429274286
